Grandmother clock



FIG. 1 is a front perspective view of a grandmother clock, showing my design, the broken-line showing of pendulum and weights being environmental only and forming no part of the claimed design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a plan top view thereof; and,

FIG. 4 is a plan bottom view thereof. 

The ornamental design for a grandmother clock, as shown and described. 